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    • 2. 发明授权
    • Method for producing cast alloy and magnet
    • 铸造合金和磁铁的生产方法
    • US5963774A
    • 1999-10-05
    • US65564
    • 1998-04-24
    • Shiro SasakiHiroshi HasegawaYoichi Hirose
    • Shiro SasakiHiroshi HasegawaYoichi Hirose
    • C22C1/04C22C28/00H01F1/057B22F3/12
    • H01F1/057C22C1/0441C22C28/00H01F1/0571H01F1/0577B22F2009/041B22F2998/00B22F2998/10
    • The magnetic properties of rare earth magnet are improved by means of forming a novel structure of the cast alloy used for the production of a rare earth magnet, which contains from 27 to 34% by weight of at least one rare earth element (R) including yttrium, from 0.7 to 1.4% by weight of boron, and the balance being essentially iron and, occasionally any other transition element, and comprises an R.sub.2 T.sub.14 B phase, an R-rich phase and optionally at least one ternary phase except for the R.sub.2 T.sub.14 B phase and the R-rich phase. The novel structure is that the volume fraction (V) in percentage of said R.sub.2 T.sub.14 B phase and said at least one ternary phase is more than 138-1.6r (with the proviso that r is the content of R), the average grain size of the R.sub.2 T.sub.14 B phases is from 10 to 100 .mu.m and, further, the average spacing between the adjacent R-rich phases is from 3 to 15 .mu.m. The novel structure can be formed by by means of feeding alloy melt onto a rotary casting roll, cooling in a temperature range of from melting point to 1000.degree. C. at a cooling rate of 300.degree. C. per second or more, and further cooling in a temperature range of from 800 to 600.degree. C. at a cooling rate of 1.degree. C./second or less.
    • 通过形成用于制备稀土磁体的铸造合金的新型结构,稀土类磁体的磁特性得到改善,该稀土类磁铁含有27〜34重量%的至少一种稀土元素(R),包括 钇,0.7至1.4重量%的硼,余量基本上为铁,偶尔为任何其它过渡元素,并且包括R2T14B相,富R相和任选的至少一个三元相,除了R2T14B相和 富R相。 新结构是所述R2T14B相和所述至少一个三元相的百分比的体积分数(V)大于138-1.6r(条件是r是R的含量),平均粒径 R2T14B相为10〜100μm,相邻的富R相之间的平均间隔为3〜15μm。 该新型结构可以通过将合金熔体供给到旋转铸辊上,以300℃/秒或更高的冷却速度在熔点为1000℃的温度范围内冷却,并进一步冷却 在800〜600℃的温度范围内,以1℃/秒以下的冷却速度。
    • 5. 发明授权
    • Cast alloy used for production of rare earth magnet and method for
producing cast alloy and magnet
    • 用于生产稀土磁体的铸造合金和用于生产铸造合金和磁体的方法
    • US5908513A
    • 1999-06-01
    • US838784
    • 1997-04-10
    • Shiro SasakiHiroshi HasegawaYoichi Hirose
    • Shiro SasakiHiroshi HasegawaYoichi Hirose
    • C22C1/04C22C28/00H01F1/057
    • H01F1/057C22C1/0441C22C28/00H01F1/0571H01F1/0577B22F2009/041B22F2998/00B22F2998/10
    • The magnetic properties of rare earth magnet are improved by means of forming a novel structure of the cast alloy used for the production of a rare earth magnet, which contains from 27 to 34% by weight of at least one rare earth element (R) including yttrium, from 07 to 1.4% by weight of boron, and the balance being essentially iron and, occasionally any other transition element, and comprises an R.sub.2 T.sub.14 B phase, an R-rich phase and optionally at least one ternary phase except for the R.sub.2 T.sub.14 B phase and the R-rich phase. The novel structure is that the volume fraction (V) in percentage of said R.sub.2 T.sub.14 B phase and said at least one ternary phase is more than 138-1.6r (with the proviso that r is the content of R), the average grain size of the R.sub.2 T.sub.14 B phases is from 10 to 100 .mu.m and, further, the average spacing between the adjacent R-rich phases is from 3 to 15 .mu.m. The novel structure can be formed by by means of feeding alloy melt onto a rotary casting roll, cooling in a temperature range of from melting point to 1000.degree. C. at a cooling rate of 300.degree. C. per second or more, and further cooling in a temperature range of from 800 to 600.degree. C. at a cooling rate of 1.degree. C./second or less.
    • 通过形成用于制备稀土磁体的铸造合金的新型结构,稀土类磁体的磁特性得到改善,该稀土类磁铁含有27〜34重量%的至少一种稀土元素(R),包括 钇,从07至1.4重量%的硼,余量基本上为铁,偶尔为任何其它过渡元素,并且包含R2T14B相,富R相和任选的至少一个三元相,除了R2T14B相和 富R相。 新结构是所述R2T14B相和所述至少一个三元相的百分比的体积分数(V)大于138-1.6r(条件是r是R的含量),平均粒径 R2T14B相为10〜100μm,相邻的富R相之间的平均间隔为3〜15μm。 该新型结构可以通过将合金熔体供给到旋转铸辊上,以300℃/秒或更高的冷却速度在熔点为1000℃的温度范围内冷却,并进一步冷却 在800〜600℃的温度范围内,以1℃/秒以下的冷却速度。
    • 8. 发明授权
    • Alloy for use in preparation of R-T-B-based sintered magnet and process for preparing R-T-B-based sintered magnet
    • 用于制备R-T-B系烧结磁体的合金和制备R-T-B系烧结磁体的方法
    • US06444048B1
    • 2002-09-03
    • US09530274
    • 2000-06-19
    • Hiroshi HasegawaYoichi Hirose
    • Hiroshi HasegawaYoichi Hirose
    • H01F1057
    • H01F1/0577B22F2998/10C22C1/0441C22C38/001C22C38/002B22F1/0003B22F3/1035
    • Processes for the preparation of a sintered alloy comprising R2Fe14B as a magnetic phase constituting a main phase include a binary alloy process wherein a main phase alloy having a lower R content than the above phase is mixed with a grain boundary phase alloy rich in R component and serving as a liquid phase in the sintering in order to prepare a mixture to be used as the starting material. The conventional main phase alloy has a structure comprising the R2Fe14B phase and, in addition, a large amount of an easily oxidizable lamella R-rich phase and a harmful dendrite &agr; phase. On the other hand, the main phase alloy of the invention has a low dendrite a phase content and a low lamella R-rich phase and contains a lamella &agr; Fe phase. This contributes to excellent oxidation resistance and improved properties of the magnet. The preparation of a sintered magnet by mixing the main phase alloy with the grain boundary phase alloy by the binary alloy method can reduce abnormal growth of crystal grains.
    • 制备包含R2Fe14B作为构成主相的磁性相的烧结合金的方法包括二元合金工艺,其中具有比上述相低的R含量的主相合金与富含R成分的晶界相合金混合, 在烧结中用作液相以制备用作起始材料的混合物。 常规的主相合金具有包含R2Fe14B相的结构,另外还含有大量容易氧化的薄层富R相和有害枝晶α相。 另一方面,本发明的主相合金具有低枝状相含量和低薄片富R相,并含有薄片αFe相。 这有助于优异的抗氧化性和改善的磁体性能。 通过二次合金法将主相合金与晶界相合金混合制备烧结磁体可以减少晶粒的异常生长。